On 25.08.2021 14:12, Andrew Cooper wrote: > On 24/08/2021 14:04, Jan Beulich wrote: >> On 19.08.2021 18:26, Andrew Cooper wrote: >>> In some configurations, it is safe to not overwrite the RSB on entry to Xen. >>> Both Intel and AMD have guidelines in this area, because of the performance >>> difference it makes for native kernels. >> I don't think I've come across AMD's guidelines - would you happen to >> have a pointer? > > APM Vol2 3.2.9 "Speculation Control MSRs" > > The information about SMEP is in the final paragraph before describing > MSR_SPEC_CTRL.STIBP.
Ah yes, thanks. Still need to get used to this now being in the PM rather than in one or more separate docs. I now recall reading through this. Jan
